Abstract
Transient Marangoni-buoyancy convection in an insulated rectangular tank is studied numerically using the finite volume method. The liquid is suddenly heated by a line heat source or cooled by a line heat sink being placed at the center of the free surface to initiate a thermocapillary force. Evaporation or condensation takes place on the free surface. In a low Marangoni number evaporative system, three distinct convective mechanisms are identified: surface tension-driven, buoyancy-driven and mixed convections. The effects of aspect ratio and evaporation number on flow instability and heat transfer are investigated.
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